Improvement in making lamp-black



. @UNITED STATES lPATENT OFFICE.

JOHN G. MINI, OF PHILADELPHIA', PENNSYLVANIA.

IMPROVEMENT IN MAKING LAMP-BLACK.

Specification forming: part of Letters Patent No. 3,824, dated November 13, 1844.

.To all Awhom it may concern:

Be it known that I, JOHN GILBERT MiNr, of the county of Philadelphia, State ot' Pennsylvania, have invented a new and useful Improvement in the Mann facture of Lam p-Blaek and I do hereby declare that the following is a full and exact description.

The nature of my improvement consists in being able to burn the material in large quantities and in obtaining one hundred per cent. more lamp-black from the same quantity of material than had been obtained before this invention was known.

To enable others skilled in the art to make and use my improvement@ will proceed to describe its construction and Operation.

Ifit be desirable to burn the bulk of a barrel of resin or other material at one time, the room should contain an area of eighty feet by lifty, feet and forty feet high, and in proportion for a greater or less quan tity, or thereabout.

I construct my furnace ot' brick or iron, as seen in the accompanying drawings, and in the furliaceI place a cast-iron pot or pan, as at B, and an arch tunnel from the front and sides of the pan, as at C, this arch to be continued into the building or room which receives the lamp-black, as shown at D, at the bottom of the tunnel; and level with the top of the pan I lay a brick hearth, extending into .the

roonnas shown at F, at the front of the pan in the furnace` I make a door or opening,` in the wall to admit the material, which,together with all the windows or vent-holes, must be closed tight immediately on applying the fire to the material, as shown at H. The building or room used to receive the lamp-black must have sufficient lower and upper windows or.

vents for rapid ventilationy so soon :as the -material is done burning and has been left about thirty minutes to settle. Then open the upper and lower windows for about fteen minutes to allow the foul air to escape and fresh air to take its place. Then shu-t up again, having the material introduced first, and see that all is tight as before, Src. Having as much lampblack on the iioor as you may desire, take. it out between the fires into the packing-ronnie What I claim as my invention and improvement, and desire to secure by Letters Patent. is-

The mode herein described of `burnin g lam pblackthat is to say,burning it im@ confined building or room without chimney or draft, substantially' in the manner set forth in tlis specification. J. G.MINI.. [L. s]

Witnesses GEO. J AcKsON,

GEO. W. ASH. 

